This board is not compatible with Windows 7 and your sata drives may fail you at any time, dont risk using this board with Windows 7 at all.
I find it a little hard to believe that windows 7 was a factor. The mobo is Vista ready and most vista drivers are Win 7 compatible. Infact alot of early Win 7 drivers, and to this day still, alot of drivers are the same. I would guess it was the Mobo. Asus = Bad Nvidia Chipset = Bad ASUS + Nvidia = Even Worse
Thats good to hear, but thats not an indication that windows 7 was the problem. Now if you try the M2N again on vista, and it works, then indeed win 7 was the problem. If it doesnt work, Win 7 obviously wasnt the culprit and it was simply the mobo going out. I had an ASUS P5N-D fail on me in under a year.
I tried this board on Vista and 7 and it runs well on Vista but sata fails on 7 so it means that the board cant handle Windows 7. My new Asus M4A78L-M is working perfectly with Windows 7.
The M2N-SLI is not one of Asus' worst boards, which is no honour, but it does mean it is better than hundreds of other boards the company has made. I was until today unaware that the M2N was incompatible with Win7. Believe it or not this has been a genuine issue in the past. The P5N-E SLI was one such example, only a very small handful of the boards produced could install Windows Vista due to a design defect in the hardware. Thankfully since the board is in the top 10 least reliable motherboards of all time hall of fame, it was not made a big deal of due to all the boards' other problems. I will warn you, that there is no guarantee (or even much likelihood) that the new board you have purchased is any more reliable than the one it replaced.
That's not the impression I got. From the sentence you quote it sounds like he used to use Vista, then the problems started when he upgraded to 7...
No, but knowing a similar story from nforce boards and Asus in the past, I'd say it's quite likely it's an OS incompatibility.